The order of the throw-ins and
is very important. If Black captures with
, White descends with
.
Black has three points to connect: , a, b. But the
chain has only two liberties.
If connects,
captures the chain in a snapback.
But this is not yet the solution.
Now, presenting the actual solution.
The strongest resistance by Black is , and is the only way to salvage the situation. This is the solution, which is a direct ko. If Black wins this ko, he simply captures at a, and the white chain on the left is captured cleanly.
There is a local ko threat at .
The hane at is a failure. As
is a necessary approach move, Black connects at
just in time, so there is no connect-and-die.
If in the solution diagram makes a throw-in on the left side first, then
can connect. The result is the same as the previous failure diagram.